Electrical water heater



H. MEHN. ELECTRICAL WATER HEATER. APPLICATION mm OCT- 12. 1921.

1,418,01 1 Patented y 30,1922.

UNITED. STATES PATENT OFFICE.

HERMANN MEHN, O13 BERLIN-TEMPELHOF, GERMANY, ASSIGNOR TO DB1. KURT GLAHN, OF BERLIN-WILMERSDORF, PRUSSIA, GERMANY.

ELECTRICAL WATER HEATER.

To m7 whom may concern:

Be it known that I, HnnMANN MnHN, citison of the German Republic, residing at Berlin-Tenipelhof, in the State of Prussia, Germany, have invented certain new and useful Improvements in. Electrical ater l'leaters, of which the following is a specification.

This invention relates to an electrical water heater, a socalled hot-water dispenser. 55inch heaters or dispensers are, in general, known, butin particular they are possessed of certain drawbacks, especially great consumption of current, low efficiency, high purchasing price. In eontradistinction to all this the improved water heater consumes but little current, its efficiency is excellent, it is of very simple con truetion, also very durable, and its purchasing price is low.

his heater consists of a plurality of flat boxes which are arranged one above, or below, the other, but alternate with electrical heating bodies. The walls of the boxes are s shaped that the water, in passing through any one of them, is compelled to take a long way, preferably in such a manner, that it flows through concentric channels of semicircular shape which are connected with each other in series, each box having two such sets of channels and the two set being also connected in series with each other, as I are also the boxes themselves. The thus communicating channels form avery long way, in which the water is highly heated by the electrical heating bodies which are in close contact with the Walls of the said boxes. Also the heating bodies are flat, and their diameter corresponds to that of the boxes; they consist of a heat-proof, refractory, sub stance enclosing the wires traversed by the current. Preferably china is employed as refractory material, but any substance may be made use of. i

The boxes consist each of two plates which form a space between them and are tightly united with each other at their rims or edges. Each plate has a plurality of semi-circular ribs which project into the before-mentioned space, and the ribs of the one plate extend into the grooves formed by the ribs of the other plate, whereby the long channel consisting of semi-circular parts which are connected with each other in series is produced.

In order to make my invention more clear,

I refer to the accompanying drawing, in

Specification of Letters Iatent. Patented Diary 30, 1922. Application filed October 12, 1921.

Serial No. 507,361..

which similar letters denote similar parts throughout the several views, and in which Figure .l is a sideview of the novel heater, the outer casing and the connection with the water-supply being shown in vertical section; Fig. 2 is a vertical section through the set of boxes and and Figure 3 is a plan of the heating device proper, showing. however, merely the upper box and some surrounding parts.

The water cock 0.0 has at its end an external thread xi a socket is is attached by a cap nut 7b to that cock; 5 a packing ring inserted between the parts w and la. The heater casing has a threaded branch Z which may be screwed into the lower end of the socket k, This latter has a fine bore (L by which the pressure of the water passing from the cock to through the socket 7c into the heater is greatly throttled; whereby bulging out or the flat hollow boxes, as well as their becoming untight, is prevented.

The socket is is connected by tube 9 with the periphery of the uppermost box Z). livery box consists of an upper plate and a lower plate both of which are united with each other at their peripheries by folds and soldering. Each of these plates have semicircular ribs n which extend into the interior of the box; the ribs of the upper plate extend into the grooves between the ribs of the lower plate, and reversely, and the arrangement is such that semi-circular channels r are formed which are connected in series with each other, shown in Figure 3. There are two sets of such channels in each plate and these sets are also connected in series with each other. The same is true of the connection of the boxes with each other. There are curved pipes which conduct the water from. one disk to the next, in the direction from the inlet socket is to the delivery nozzle 1 which. is screwed to the threaded branch (1 attached to the lowest pipe 9 The arrows shown in Figure 3 indicate the direction of the water in the uppermost box. The same direction is in the other boxes, viz, from the periphery to the centre and back to the periphery.

Between every two boxes is a heating body (Z consisting of china or the like and containing the heating wires through which the electric current is passed. Each heating body is in direct contact with two boxes I) (Figure 2), and the whole structure (I) d b d b the set of heating bodies,

(Z 6) is held together by angular bands on as shown in Figures 1 and 3. The heating wires are connected in. parallel by means of bolts p, of Which there are two, one for the positive supply Wire, the other tor the negative one. 0 are these Wll'QS which lead to plugs c projecting laterall from the casing f enclosing the whole heating structure. This casing consists ol a body and a. cover or lid which are connected to each other by screws Having now described my in vontion, what I desire to secure by a patent of the United States is:

1. An electric Water heater, comprising, in combination, dish-slimpen electric heating bodies, and flat boxes arranged in alternation with said bodies and having each in 'artlly extending ribs in its top and in its bottom, the upper ribs extending into the grooves between the lower ones, anrl reversely, all grooves forming a continuous water passage.

:2. An electric Wat heater, coinprisiinr combinat on, disk-:nznaerl electric heating: borlies, and lint boxes arranged in alternation with said boiiics anil ha vino each inivarill" extending ribs o l semi-circular shape in top anzl in its bottom, the upper ribs extendinginto the grooves between the lower ones, anil reversel v, anil all grooves :lforining a continuous u'ajer passage.

53. An electric ater h ater, coni lrising, in ron'ibination, disk-shaped electric healing: br iies,a1nl flat boxes arranged in alternation with said bodies and having); each two sets (it in u'arilly extein'ling ribs o'l' scn'ii-circular shape in its top anrl in its bottom, the upper ribs e:;tcn lin;,1' into the grooves between the lower ones, and revcrsely. and all grooves 'lorming a continuous water passage. 7

In testimony whereof. I have Zlillitftl liif signature.

HERMAVN MEH 

